XY precoder for MIMO systems | IEEE Conference Publication | IEEE Xplore

XY precoder for MIMO systems


Abstract:

In multiple-input multiple-output (MIMO) channels with discrete input alphabets, at high signal-to-noise ratio (SNR), maximizing the minimum Euclidean distance (dmin) bet...Show More

Abstract:

In multiple-input multiple-output (MIMO) channels with discrete input alphabets, at high signal-to-noise ratio (SNR), maximizing the minimum Euclidean distance (dmin) between all possible received constellation points is known to be the optimal precoding strategy. However, finding the optimal precoder has been proved to be NP-hard. For large MIMO, a promising practical approach is to transform the channel into parallel 2 × 2 MIMO subchannels and then precode each of them separately. However, existing methods are mostly based on heuristic subchannel pairing schemes and require numerical search/optimization in the design phase. In this work, we propose a novel real-valued precoder, named as XY-precoder, which enjoys an explicit construction, a provable dmin, a provably optimal subchannel pairing scheme, and low ML-decoding complexity. We prove that the XY-precoder achieves the same diversity order as the best known precoder, but with a much lower decoding complexity. Simulation results confirm that the error performance of XY-precoder is almost the same as that of the best known precoders.
Date of Conference: 06-10 November 2017
Date Added to IEEE Xplore: 01 February 2018
ISBN Information:
Conference Location: Kaohsiung, Taiwan

References

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